[Feature Request]: playground v2.5 sampler support

### Is there an existing issue for this?

- [X] I have searched the existing issues and checked the recent builds/commits

### What would your feature do ?

The pipeline uses the EDMDPMSolverMultistepScheduler scheduler by default, for crisper fine details. It's an EDM formulation of the DPM++ 2M Karras scheduler. guidance_scale=3.0 is a good default for this scheduler.
The pipeline also supports the EDMEulerScheduler scheduler. It's an EDM formulation of the Euler scheduler. guidance_scale=5.0 is a good default for this scheduler.

### Proposed workflow

1. install diffusers >= 0.27.0
2. add support for any of the sampler (EDMDPMSolverMultistepScheduler/EDMEulerScheduler)

### Additional information

_No response_

No file or test is named in the issue. Start by locating the playground's sampler configuration and checking how it pins or imports diffusers; then trace the existing scheduler selection. Done means the playground supports EDMDPMSolverMultistepScheduler or EDMEulerScheduler with the appropriate guidance-scale default.

Written by the indexing model from the issue text.